CN1273855C - Liquid crystal device its mfg. method, and electronic device - Google Patents

Liquid crystal device its mfg. method, and electronic device Download PDF

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CN1273855C
CN1273855C CNB03150079XA CN03150079A CN1273855C CN 1273855 C CN1273855 C CN 1273855C CN B03150079X A CNB03150079X A CN B03150079XA CN 03150079 A CN03150079 A CN 03150079A CN 1273855 C CN1273855 C CN 1273855C
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liquid
liquid crystal
hardening
crystal apparatus
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CN1475848A (en
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百濑洋一
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Seiko Epson Corp
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Seiko Epson Corp
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    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1339—Gaskets; Spacers; Sealing of cells
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1341—Filling or closing of cells

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Liquid Crystal (AREA)

Abstract

The present invention provides a liquid crystal device which can be cured in a relatively short period of time and which has a sufficient adhesion strength. A liquid crystal display device (100) has: a liquid crystal layer provided between a pair of substrates (10, 20), and a sealing material (52) which bonds the pair of substrates (10, 20) to each other and which encloses the liquid crystal layer between the above substrates. The sealing material (52) contains a photocurable component and a thermosetting component, in which the maximum curing rate of the photocurable component is set to 60% to 95%, and the curing rate of the thermosetting component is set to 60% to 90%.

Description

The manufacture method of liquid-crystal apparatus, liquid-crystal apparatus and electronic equipment
Technical field
The present invention relates to the manufacture method of liquid-crystal apparatus, liquid-crystal apparatus and possess the electronic equipment of this liquid-crystal apparatus, particularly relate to and possess the liquid-crystal apparatus that liquid crystal layer is sealed in the encapsulant in the substrate.
Background technology
As existing liquid-crystal apparatus, have on the edge part of separately substrate through the bonding downside substrate of encapsulant and upside substrate, the structure of between this a pair of substrate, enclosing liquid crystal layer.As encapsulant, general known thermosetting resin or the utilization ultraviolet ray that the utilization heating is arranged and harden shone and the ray hardening resin of sclerosis.
But in general, ray hardening resin is compared most intensity with thermosetting resin lower, and on the other hand, thermosetting resin is compared most firm time with ray hardening resin longer, is being unfavorable aspect the manufacturing efficient.
In addition, for example using under the situation of epoxy resin as hardening resin, as the rigidizer of epoxy resin, the known organic acid that has mineral acid that photo-hardening uses and thermmohardening to use.If the mineral acid that photo-hardening is used is as the encapsulant of liquid-crystal apparatus, then this mineral acid stripping is in liquid crystal, sometimes cause the decline of the demonstration grade that decline, the threshold value of the resistivity of liquid crystal is irregular etc., therefore, it is comparatively desirable that the organic acid that thermmohardening is used is used in the liquid-crystal apparatus.If the organic acid that this thermmohardening is used is used as rigidizer, then this organic acid composition combines with epoxy resin after the sclerous reaction, can stripping in liquid crystal, there is not the possibility that causes that demonstration grade as described above descends, even so, but compare with the situation of photo-hardening, have the elongated problem of firm time.
On the other hand, using under the situation of acrylic resin as ray hardening resin, its bonding force than epoxy resin a little less than, if only use the encapsulant of this acrylic resin to make liquid-crystal apparatus, then have the unfavorable condition that can not obtain full intensity.
Summary of the invention
The present invention carries out in view of the above-mentioned problems, and its purpose is to provide can harden, possess simultaneously the liquid-crystal apparatus of sufficient adhesion strength, the manufacture method of this liquid-crystal apparatus and the electronic equipment that possesses this liquid-crystal apparatus in the relatively shorter time.
In order to solve above-mentioned problem, liquid-crystal apparatus of the present invention is clamping liquid crystal layer and the liquid-crystal apparatus that constitutes between a pair of substrate, it is characterized in that: possess in bonding above-mentioned a pair of substrate the encapsulant that above-mentioned liquid crystal layer is sealed in the substrate, the sealing material comprises photo-hardening composition and thermosetting composition, the maximum hardening ratio of above-mentioned photo-hardening composition is 60%～95%, and the hardening ratio of above-mentioned thermosetting composition is 60%～90%.
According to such liquid-crystal apparatus, because encapsulant possesses photo-hardening composition and thermosetting composition simultaneously, the maximum hardening ratio of photo-hardening composition is 60%～95%, the hardening ratio of thermosetting composition is 60%～90%, so compare with the situation of independent use thermosetting composition, can harden at short notice, and compare with the situation of independent use photo-hardening composition, can improve intensity, on the other hand, by the hardening ratio that makes each composition is optimum value, can possess bonding strength and sealing fully.Have again, if the maximum hardening ratio of photo-hardening composition surpass 95% or the hardening ratio of thermosetting composition surpass 90%, then encapsulant becomes fragile sometimes, bonding strength descends.In addition, if the maximum hardening ratio of photo-hardening composition less than 60%, then cell gap (substrate at interval) can not keep even sometimes.Moreover, if the hardening ratio of thermosetting composition less than 60%, then moisture is impregnated into encapsulant inside easily, has the possibility of the reliability decrease of this liquid-crystal apparatus.Have, said hardening ratio is represented the rate of change of the sclerous reaction front and back of the reactive group relevant with sclerosis among the present invention again.
Above-mentioned encapsulant can be included in the resin that possesses above-mentioned photo-hardening composition and thermosetting composition in the same strand and constitute.If use the resin that in same strand, possesses each composition by this way, then there is no need to mix unhardened 2 kinds of liquid and become easy, also can avoid the decline of the reliability of the encapsulant that under the situation of the intermiscibility difference of 2 kinds of liquid, produces on this basis at manufacture view.Have again, also can in same strand, not comprise each composition but constitute liquid-crystal apparatus with the encapsulant of the type of having mixed ray hardening resin and thermosetting resin.In addition, above-mentioned encapsulant also can comprise the resin with above-mentioned photo-hardening composition, the resin with above-mentioned thermosetting composition and possess the resin of above-mentioned photo-hardening composition and thermosetting composition and constitute in same strand.
Have, above-mentioned photo-hardening composition can comprise acryloyl group and/or methacryl again, and on the other hand, above-mentioned thermosetting composition comprises epoxy radicals.And, for the thermosetting composition that comprises epoxy radicals, for example can use organic acid as rigidizer.
Secondly, the manufacture method of the liquid-crystal apparatus of above-mentioned record for example can comprise following manufacturing process.Promptly, the manufacture method of liquid-crystal apparatus of the present invention is a clamping liquid crystal layer and the manufacture method of the liquid-crystal apparatus that constitutes is characterized in that: comprise following operation between a pair of substrate: the operation that in the zone at least one side's of above-mentioned a pair of substrate surface in the aforesaid substrate face bonding agent is formed the frame shape of sealing; The operation of configuration liner at least one side's of above-mentioned a pair of substrate surface; After having disposed these bonding agents and liner, at least one side's of above-mentioned a pair of substrate surface, the drip operation of liquid crystal; Behind the above-mentioned liquid crystal that dripped, make the operation of above-mentioned a pair of baseplate-laminating; And the operation that after having carried out above-mentioned applying, makes above-mentioned adhesive hardens, the unhardened encapsulant that has used above-mentioned record is as above-mentioned bonding agent.
In addition, as other manufacture method, under the situation of the type of such liquid crystal injecting port, behind the substrate of having fitted, the liquid crystal injecting port that is provided with from encapsulant injects liquid crystal and makes below having used.Promptly, the different form of the manufacture method of liquid-crystal apparatus of the present invention is a clamping liquid crystal layer and the manufacture method of the liquid-crystal apparatus that constitutes is characterized in that: comprise following operation between a pair of substrate: the operation that bonding agent is formed the frame shape that possesses liquid crystal injecting port at least one side's of above-mentioned a pair of substrate surface; The operation of configuration liner at least one side's of above-mentioned a pair of substrate surface; After having disposed these bonding agents and liner, make the operation of above-mentioned a pair of baseplate-laminating; After having carried out above-mentioned applying, make the operation of above-mentioned adhesive hardens; And, used above-mentioned unhardened encapsulant as above-mentioned bonding agent through the operation of above-mentioned liquid crystal injecting port at the inner injection of above-mentioned bonding agent liquid crystal.
Utilize the manufacture method of above any type, the liquid-crystal apparatus of the structure that possesses above-mentioned encapsulant all can be provided.Particularly, in the present invention, in making the operation of adhesive hardens, can comprise rayed operation that makes the sclerosis of photo-hardening composition and the heating process that makes the sclerosis of thermosetting composition at least.
In the rayed operation, the rayed amount is preferably 1000mJ/cm 2～6000mJ/cm 2In the rayed amount less than 1000mJ/cm 2Situation under, can not harden fully sometimes, in addition, surpass 6000mJ/cm in the rayed amount 2Situation under, produce the mis-behave of resin sometimes.
In addition, in heating process, heating-up temperature is decided to be 60 ℃～160 ℃, will be decided to be 20 minutes～300 minutes heat time heating time is comparatively desirable.The light heating-up temperature less than 60 ℃ situation under or heat time heating time less than 20 minutes situation under, can not harden fully sometimes, in addition, surpass 160 ℃ or surpass under 300 minutes the situation heat time heating time in heating-up temperature, produce the mis-behave of resin sometimes.
Secondly, electronic equipment of the present invention is characterised in that as display device to possess liquid-crystal apparatus for example as described above.Like this, by possessing liquid-crystal apparatus of the present invention, can provide the bad few high electronic equipment of reliability of generation.
Description of drawings
Fig. 1 is the planimetric map of seeing from subtend substrate one side with the liquid crystal indicator of the embodiment of the present invention of each inscape.
Fig. 2 is the sectional view along the H-H ' line of Fig. 1.
Fig. 3 is with the equivalent circuit diagram of the various elements in a plurality of pixels of rectangular formation, wiring etc. in the image display area of this liquid crystal indicator.
Fig. 4 is the part amplification profile of this liquid crystal indicator.
Fig. 5 is the planimetric map of variation that the liquid crystal indicator of Fig. 1 is shown.
Fig. 6 is the oblique view that an example of the electronic equipment that has used electro-optical device of the present invention is shown.
Fig. 7 is another routine oblique view that this electronic equipment is shown.
Fig. 8 is the oblique view that the another example of this electronic equipment is shown.
Fig. 9 is the figure that the relation of UV exposure in the acrylic acid series composition and hardening ratio is shown.
Embodiment
Below, on one side with reference to accompanying drawing, embodiment of the present invention are described on one side.
Fig. 1 is that Fig. 2 is the sectional view along the H-H ' line of Fig. 1 with the planimetric map of the liquid crystal indicator of the conduct embodiment of the present invention of seeing from subtend substrate one side shown in each inscape.Fig. 3 be in the image display area of this liquid crystal indicator with the equivalent circuit diagram of the various elements in a plurality of pixels of rectangular formation, wiring etc., Fig. 4 is the part amplification profile of liquid crystal indicator.Have again, among each figure of Shi Yonging, become the size of discernible degree on drawing in the following description, make the engineer's scale difference for each layer or each member in order to make each layer or each member.
In Fig. 1 and Fig. 2, in the liquid crystal indicator 100 of the present embodiment, utilize encapsulant 52 applying tft array substrates 10 and subtend substrate 20, in the zone of dividing by sealing material 52, enclose, kept liquid crystal 50.In the zone in real estate, encapsulant 52 is formed the frame shape of sealing, make it not possess liquid crystal injecting port, become the structure that encapsulant of no use has carried out the vestige of sealing.
In the area inside in the formation zone of encapsulant 52, formed the periphery blocking 53 that constitutes by the light-proofness material.In the zone in the outside of encapsulant 52, one side along tft array substrate 10 be provided with data line drive circuit 201 and mounting terminal 202, one side be provided with scan line drive circuit 204 along 2 limits with this adjacency.On remaining one side of tft array substrate 10, be provided with the wiring 205 of 204 of many scan line drive circuits that are used for connecting the both sides that are arranged on image display area.In addition, at least 1 position in the bight of subtend substrate 20, be provided with conductive material 206 between substrate, be used between tft array substrate 10 and subtend substrate 20, carrying out the conducting of electric conductivity.
Have again, for example also can by anisotropic conductive film with the mode of electric conductivity and mechanical system connection for example drive with TAB (band automated bonding) substrate of LSI and the terminal group that on the periphery of tft array substrate 10, forms, replace formation data line drive circuit 201 and scan line drive circuit 204 on tft array substrate 10.In addition, in liquid crystal indicator 100, according to the kind of employed liquid crystal 50, be the mode of operation and the normal white mode/difference of black pattern often of TN (twisted-nematic) pattern, STN (supertwist is to row) pattern etc., configuration phase difference sheet, polaroid etc. on the direction of regulation, but omit diagram at this.
In addition; showing liquid crystal indicator 100 under the situation that is used for constituting as colour; in subtend substrate 20, at the color filter that in the zone of each pixel electrode subtend described later, for example forms red (R), green (G), blue (B) of tft array substrate 10 with its diaphragm.
In the image display area of liquid crystal indicator 100 with such structure, as shown in Figure 3, with a plurality of pixel 100a of rectangular formation, in these pixels 100a, formed the TFT30 that pixel switch is used respectively, supply with picture element signal S1, S2 ..., be connected to the source electric conductivity of the data line 6a of Sn and TFT30.Be written to picture element signal S1, S2 among the data line 6a ..., Sn can supply with in the mode of line order by this order, also can be mutual for many adjacent data line 6a, supply with each group.In addition, the grid electric conductivity of sweep trace 3a and TFT30 ground is connected, with the sequential of stipulating, with pulse mode with the mode of line order by following order to sweep trace 3a apply sweep signal G1, G2 ..., Gm.
Pixel electrode 9 is connected electrically with the leakage conductance of TFT 30, by making TFT30 conducting in only during certain as on-off element, with time ordered pair each pixel of regulation write the picture element signal S1, the S2 that supply with from data line 6a ..., Sn.Through pixel electrode 9 be written to by this way the specified level on the liquid crystal picture signal S1, S2 ..., Sn and Fig. 2 shown in subtend substrate 20 on be held in during certain between the counter electrode 21 that forms.Have again, for prevent maintained picture element signal S1, S2 ..., Sn sews, and the additional side by side reservoir capacitor 60 of the liquid crystal capacitance that is formed between pixel electrode 9 and subtend substrate.For example, utilize 60 voltages that in than the time of long 3 orders of magnitude of the time that applies source voltage, keep pixel electrode 9 of reservoir capacitor.
Thus, the retention performance of electric charge can be improved, the high liquid crystal indicator of contrast 100 can be realized.
Fig. 4 is the part amplification profile of liquid crystal indicator 100, on the tft array substrate 10 that constitutes based on glass substrate 10 ',, be connected on these each pixel electrodes 9 to the TFT30 that pixel switch is used (with reference to Fig. 3) electric conductivity respectively with the rectangular pixel electrode 9 (with reference to Fig. 3) that has formed based on the transparency electrode formation of ITO (indium tin oxide).In addition, the border in length and breadth along having formed the zone of pixel electrode 9 has formed data line 6a, sweep trace 3a and capacitor line 3b, and TFT30 is connected on data line 6a and the sweep trace 3a.That is, data line 6a through contact hole 8 electric conductivity be connected on the high concentration source region 1a of TFT30, pixel electrode 9 through contact hole 15 and drain electrode 6b electric conductivity be connected on the high concentration drain region of TFT30.Have again, in the top layer of pixel electrode 9, formed the alignment films 12 of having carried out milled processed for the film that with the polyimide is the main body formation.
On the other hand, in subtend substrate 20, the glass substrate 20 ' of subtend substrate one side go up and the zone of on tft array substrate 10 and borderline region subtend in length and breadth pixel electrode 9 in, formed the photomask 23 that is called as black matrix" or black bar, layer side formed the counter electrode 21 that is made of the ITO film thereon.In addition, the upper layer side at counter electrode 21 has formed the alignment films 22 that is made of polyimide film.And, utilize encapsulant 52 (with reference to Fig. 1) between tft array substrate 10 and subtend substrate 20, between substrate, to enclose liquid crystal 50.
In the liquid crystal indicator 100 of such structure, encapsulant 52 has feature, specifically, encapsulant 52 comprises photo-hardening composition and thermosetting composition, the photo-hardening composition is that main body constitutes with the acrylic resin, and maximum hardening ratio is 60%～95% (for example 85%), on the other hand, the thermosetting composition is that main body constitutes with epoxy resin, and hardening ratio is 60%～90% (for example 80%).Have, the photo-hardening composition can the metha crylic resin be that main body constitutes also again, moreover, as encapsulant 52, also can use the resin that in same strand, possesses acryloyl group and epoxy radicals.
Secondly, the manufacture method of liquid crystal indicator 100 is described.Particularly illustrate encapsulant from manufacturing process be formed under the liquid crystal drop, the operation of baseplate-laminating, sealing material curing.
At first, as shown in Figure 4, go up formation TFT30, form pixel electrode 9 and alignment films 12 etc. again to obtain tft array substrate 10 at glass substrate 10 ', on the other hand, go up formation photomask 23, counter electrode 21, alignment films 22 etc. to obtain subtend substrate 20 at glass substrate 20 '.At at least one side's of tft array substrate 10 and subtend substrate 20 substrate (for example tft array substrate 10) go up the frame shape (with reference to Fig. 1) that bonding agent formed sealing thereafter.At this moment, suppose and utilize the method for drawing used dispenser to form with the shape of regulation.
Secondly, scatter bonding liner,, liner is bonded on the substrate, utilize the dispenser liquid crystal that drips in the inboard of frame shape adhesives again by carrying out predetermined heating in the inboard of this frame shape bonding agent., in a vacuum carry out the applying of substrate, after being discharged into atmosphere, make adhesive hardens thereafter.At this moment, suppose that the operation that makes adhesive hardens comprises rayed operation that makes the sclerosis of photo-hardening composition and the heating process that makes the sclerosis of thermosetting composition.
In the rayed operation, the rayed amount is decided to be 1000mJ/cm 2～6000mJ/cm 2(5000mJ/cm for example 2), on the other hand, in heating process, heating-up temperature is decided to be 60 ℃～160 ℃ (for example 100 ℃), will be decided to be 20 minutes～300 minutes heat time heating time (for example 120 minutes).Utilize such heating process to make adhesive hardens, form encapsulant.
Comprise in the liquid crystal indicator 100 of the present embodiment that the manufacture method of above such operation makes in utilization, encapsulant 52 possesses thermosetting composition and photo-hardening composition simultaneously, because the maximum hardening ratio of photo-hardening composition is decided to be 60%～95%, the hardening ratio of thermosetting composition is decided to be 60%～90%, so compare with the situation of independent use thermosetting composition, can harden at short notice, and, compare with the situation of independent use photo-hardening composition, can improve intensity, on the other hand, be optimum value by the hardening ratio that makes each composition, can possess bonding strength and sealing fully.Thereby, can be provided at the display characteristic aspect good, liquid crystal indicator few, that reliability is high takes place in unfavorable condition.
Have again, in the above-described embodiment, made the encapsulant of the frame shape of remaining silent, but also the resin with photo-hardening composition and thermosetting composition as described above can be applied to possess the encapsulant of liquid crystal injecting port.Promptly, the encapsulant 52 of the liquid crystal indicator 101 shown in Fig. 5 possesses the liquid crystal injecting port of using at applying tft array substrate 10 and subtend substrate 20 back injection liquid crystal during fabrication 55, after liquid crystal injects, utilize encapsulant 54 to seal this liquid crystal injecting port 55.In such liquid crystal indicator 101, inject liquid crystal after supposing the operation of baseplate-laminating during fabrication, and then sealing the sclerous reaction of carrying out encapsulant behind the liquid crystal injecting port.
(electronic equipment)
Secondly, illustrate possess the liquid crystal indicator that illustrates in the above-described embodiment the concrete example of electronic equipment.
Fig. 6 is the stereographic map that an example of mobile phone is shown.In Fig. 6, label 1000 expression mobile phone main bodys, label 1001 expressions possess the liquid crystal display part of the liquid-crystal apparatus of above-mentioned embodiment.
Fig. 7 is the stereographic map that an example of Wristwatch-type electronic equipment is shown.In Fig. 7, label 1100 expression wrist-watch main bodys, label 1101 expressions possess the liquid crystal display part of the liquid-crystal apparatus of above-mentioned embodiment.
Fig. 8 is the stereographic map of an example that the portable information processor of word processor, personal computer etc. is shown.In Fig. 8, label 1200 expression signal conditioning packages, the input part of label 1202 expression keyboards etc., label 1204 expression information processing main bodys, label 1206 expressions possess the liquid crystal display part of the liquid-crystal apparatus of above-mentioned embodiment.
Like this, because the electronic equipment separately shown in Fig. 6～Fig. 8 possesses liquid-crystal apparatus some of above-mentioned embodiment, so become electronic equipment good, that reliability is high aspect display quality.
(embodiment)
Secondly, in order to confirm the characteristic of liquid-crystal apparatus of the present invention, carried out following embodiment.
(embodiment 1)
At first; the liquid crystal indicator of embodiment 1 has been to use and has comprised as the acryloyl group of photo-hardening composition with as the resin of the epoxy radicals of the thermosetting composition situation as bonding agent, and wherein having used dispenser to form does not have the encapsulant of the frame shape of remaining silent of liquid crystal injecting port.Specifically, on the glass substrate of 370mm * 470mm, utilize dispenser to draw above-mentioned bonding agent after, with 100/mm of density 2The bonding liner of the resin system of distribution by 100 ℃ of heating 10 minutes, is bonded on the substrate surface this liner as liner.Thereafter, utilizing the dispenser liquid crystal that drips in the bonding agent frame inside of the substrate that has printed bonding agent, is 4 μ m, adhesive substrates in a vacuum with the object element gap.
After applying, be released in the atmosphere, for substrate surface, use to be output as 100mW/cm 2High-pressure mercury-vapor lamp (365nm) carries out the UV irradiation as the UV irradiator, secondly, heats in stove.Have again, change, as shown in table 1～table 3, formed the encapsulant that the hardening ratio (%) of maximum hardening ratio (%), the epoxy radicals of acryloyl group has nothing in common with each other by making UV irradiation time and the heat time heating time in stove, heating-up temperature.Behind such hardening process that is undertaken by UV irradiation and heating, be cut into catercorner length and be 2 inches STN panel (not having color filter), obtained the liquid crystal indicator of the structure shown in Fig. 1.
Then, carry out sealing intensity inspection, reliability evaluation, cell gap inspection, measured the fraction defective (%) of each different liquid crystal indicator of hardening ratio (%) respectively for resulting liquid crystal indicator.
The sealing intensity inspection is carried out according to JIS R1601, in JIS R1601, loading velocity is 0.5mm/min, in the present embodiment, loading velocity is decided to be 0.1mm/sec, has investigated the incidence (%) that the sealing of placing 10 seconds under the state that after beginning 10 seconds from loading, promptly loads 1.0mm is peeled off.In result shown in the table 1.
About reliability evaluation, after having placed 500 hours under the condition of 60 ℃ of temperature, humidity 90%, investigated the bad incidence (%) that takes place through encapsulant because of moisture.In result shown in the table 2.
In addition,, after heating finishes, estimate the cell gap homogeneity in the panel face behind the panel that has been cut into, investigated the bad incidence (%) of cell gap about the cell gap evaluation.
Have, cell gap is bad, and to surpass 0.05 μ m with the cell gap in the face on scope be object again.In result shown in the table 3.
[table 1]
[table 2]
[table 3]
Figure C0315007900142
As shown in table 1, about sealing intensity, be under 95% the situation at the hardening ratio of epoxy radicals (epoxy composition); sometimes cause strength degradation; in addition, surpass under 97% the situation, also cause strength degradation sometimes at the maximum hardening ratio of acryloyl group (acrylic acid series composition).On the other hand, be 50～90% at the hardening ratio of epoxy radicals, the maximum hardening ratio of acryloyl group is under 50～95% the situation, for sealing intensity, to demonstrate good result.
As shown in table 2, about reliability evaluation, under the hardening ratio of epoxy radicals is situation below 55%, cause excessive moisture absorption sometimes.On the other hand, be under 60～95% the situation, at the hardening ratio of epoxy radicals no matter the maximum hardening ratio of acryloyl group how, for reliability evaluation, all demonstrates good result.
As shown in table 3, about the bad incidence of cell gap, under the maximum hardening ratio of acryloyl group was situation below 55%, the cell gap in the face surpassed 0.05 μ m on scope sometimes.On the other hand, if the maximum hardening ratio of acryloyl group surpasses 60%, then no matter the hardening ratio of epoxy radicals how, for the bad generation evaluation of cell gap, all demonstrates good result.
As a comparison, investigated the sealing intensity bad incidence of the situation of the liquid crystal indicator that only uses the encapsulant that constitutes by the acrylic acid series composition.Specifically, only the encapsulant that is made of the acrylic acid series composition comprises UV cured dose and emboliform thermoinitiators as rigidizer, and curing condition is such, at irradiation 1500mJ/cm 2Ultraviolet ray make maximum hardening ratio rise to about 50% after, by adjusting down the hardening ratios that obtain stipulating heat time heating time, investigated the bad incidence of sealing intensity of every kind of hardening ratio at 120 ℃.In result shown in the table 4.
[table 4]
The maximum hardening ratio of acrylic resin 50 55 60 70 80 90 95 97 99
The bad incidence of sealing intensity 100 100 100 100 100 97 95 94 94
If only constitute encapsulant by this way, then particularly in the low scope of hardening ratio, can not obtain sufficient sealing intensity as can be known with the acrylic acid series type.
In addition, bad incidence (table 5) and the bad incidence of sealing intensity (table 6) in the reliability evaluation of situation of the liquid-crystal apparatus that only uses the encapsulant that constitutes by the epoxy composition have been investigated.Specifically, irradiation 100mW/cm 2Ultraviolet ray, by adjusting its irradiation time, obtained the hardening ratio that has nothing in common with each other, investigated the bad incidence of every kind of bad incidence of hardening ratio (table 5) and sealing intensity (table 6).
[table 5]
Hardening ratio 50 55 60 70 80 90 95
Initially 90 83 70 38 20 14 8
After 100 hours 100 100 100 100 100 100 100
[table 6]
Hardening ratio 50 55 60 70 80 85 90 95
Incidence 0 0 0 0 1 4 30 50
If use and only use up the encapsulant that indurative epoxy composition constitutes by this way, if then hardening ratio is little, the bad incidence height at initial stage in reliability evaluation then, in addition, if hardening ratio is big, the trend that then exists the bad incidence of sealing intensity to uprise promptly only is being difficult to take into account reliability and sealing intensity under the situation with the epoxy composition as can be known.
From such comparative example as can be known,, be difficult to obtain full intensity,, be difficult to obtain simultaneously sufficient reliability and sealing intensity only using under the situation of epoxy composition only using under the situation of acrylic acid series composition.
According to above result as can be known; the resin that comprises epoxy radicals and acryloyl group by use; the hardening ratio of epoxy radicals is decided to be 60%～90% and then the maximum hardening ratio of acryloyl group is decided to be 60%～95% constitutes encapsulant, can be provided at when possessing high intensity the also good and high liquid crystal indicator of reliability aspect sealing.
(embodiment 2)
Secondly, in the liquid crystal indicator of embodiment 2, use encapsulant similarly to Example 1, utilize dispenser to draw the shape of sealing material with the form that possesses liquid crystal injecting port.In this embodiment 2, for the acrylic acid series composition that hardens, also carried out the UV irradiation of the condition identical with embodiment 1, for the epoxy composition that hardens, also under the condition identical, in stove, heat with embodiment 1.About other condition, also utilize the condition identical to make with embodiment 1.For the liquid crystal indicator of resulting embodiment 2, carried out sealing intensity inspection (table 7), reliability evaluation (table 8) and cell gap inspection (table 9), checked the fraction defective (%) of each liquid crystal indicator that hardening ratio is different respectively.
[table 7]
Figure C0315007900171
[table 8]
Figure C0315007900172
[table 9]
According to above result as can be known; in encapsulant, form liquid crystal injecting port, under the situation of having injected liquid crystal behind the baseplate-laminating; also same with the embodiment 1 that does not form liquid crystal injecting port; the resin that comprises epoxy radicals and acryloyl group by use; the hardening ratio of epoxy radicals is decided to be 60%～90% and then the maximum hardening ratio of acryloyl group is decided to be 60%～95% constitutes encapsulant, can be provided at when possessing high intensity the also good and high liquid crystal indicator of reliability aspect sealing.
Have again, when estimating the maximum hardening ratio (%) of the acrylic resin that causes by the UV exposure, become the result shown in Fig. 9,, the UV exposure must be decided to be 1000～6000mJ/cm planning hardening ratio is set under 60%～95% the situation 2
In addition, in the foregoing description 1 and embodiment 2, used the black and white panel, therefore, when UV shines, on whole of encapsulant, shone UV, but under the situation of having used color panel, owing on a side substrate, color filter is arranged, on the opposing party's substrate, metal line etc. is arranged, so existence can not be carried out the possibility of UV irradiation fully to encapsulant (bonding agent), but carried out the hardening ratio of acrylic acid series composition of the part of UV irradiation, be that maximum hardening ratio is 60%～95% to get final product, even partly exist hardening ratio less than 60% part, to cell gap also almost not influence.In addition, scattered spherical resin balls, but also can make the structure of the liner of configuration dried scallop shape on substrate as liner.In addition, used acryloyl group as the photo-hardening composition, but also can use methacryl.
As above illustrated, according to liquid-crystal apparatus of the present invention, owing to make encapsulant comprise photo-hardening composition and thermosetting composition, and then the maximum hardening ratio that makes the photo-hardening composition is 60 %～95%, the hardening ratio that makes the thermosetting composition is 60%～90%, so compare with the situation of independent use thermosetting composition, can harden at short notice, and then compare with the situation of independent use photo-hardening composition, can improve intensity, on the other hand, be above-mentioned value by the hardening ratio that makes each composition, can possess fully adhesive strength and sealing.

Claims (12)

1. liquid-crystal apparatus is that clamping liquid crystal layer and the liquid-crystal apparatus that constitutes is characterized in that between a pair of substrate:
Possess in bonding above-mentioned a pair of substrate, above-mentioned liquid crystal layer is sealed in encapsulant in the substrate, the sealing material comprises photo-hardening composition and thermosetting composition, above-mentioned encapsulant, by the UV irradiation, the maximum hardening ratio of above-mentioned photo-hardening composition is 60%～95%, and because the existence of color filter or metal line, the zone that partly has above-mentioned photo-hardening composition less than 60%, the hardening ratio of above-mentioned thermosetting composition are 60%～90%.
2. the liquid-crystal apparatus described in claim 1 is characterized in that:
Above-mentioned encapsulant is included in the resin that possesses above-mentioned photo-hardening composition and thermosetting composition in the same strand and is configured.
3. the liquid-crystal apparatus described in claim 1 is characterized in that:
Above-mentioned encapsulant comprises the resin with above-mentioned photo-hardening composition, the resin with above-mentioned thermosetting composition and possesses the resin of above-mentioned photo-hardening composition and thermosetting composition and be configured in same strand.
4. liquid-crystal apparatus as claimed in claim 3 is characterized in that:
Above-mentioned photo-hardening composition comprises acryloyl group and/or methacryl.
5. the liquid-crystal apparatus described in each of claim 1 to 3 is characterized in that:
Above-mentioned thermosetting composition comprises epoxy radicals.
6. the manufacture method of a liquid-crystal apparatus is a clamping liquid crystal layer and constitute the manufacture method of liquid-crystal apparatus between a pair of substrate, it is characterized in that:
Comprise following operation:
On at least one side's of above-mentioned a pair of substrate surface, will form the operation of the frame shape of sealing in the zone of bonding agent in the aforesaid substrate face;
On at least one side's of above-mentioned a pair of substrate surface, set the operation of liner;
After having set these bonding agents and liner, the operation of the liquid crystal that at least one side's of above-mentioned a pair of substrate surface, drips;
Behind the above-mentioned liquid crystal that dripped, make the operation of above-mentioned a pair of baseplate-laminating; And
After having carried out above-mentioned applying, make the operation of above-mentioned adhesive hardens,
Used described in each of claim 1 to 3 as the unhardened material of encapsulant as above-mentioned bonding agent.
7. the manufacture method of a liquid-crystal apparatus is a clamping liquid crystal layer and constitute the manufacture method of liquid-crystal apparatus between a pair of substrate, it is characterized in that:
Comprise following operation:
On at least one side's of above-mentioned a pair of substrate surface, bonding agent is formed the operation of the frame shape that possesses liquid crystal injecting port;
On at least one side's of above-mentioned a pair of substrate surface, set the operation of liner;
After having set these bonding agents and liner, make the operation of above-mentioned a pair of baseplate-laminating;
After having carried out above-mentioned applying, make the operation of above-mentioned adhesive hardens; And
Through the operation of above-mentioned liquid crystal injecting port at the inner injection of above-mentioned bonding agent liquid crystal,
Used described in each of claim 1 to 3 as the unhardened material of encapsulant as above-mentioned bonding agent.
8. the manufacture method of the liquid-crystal apparatus described in claim 6 is characterized in that:
Make the operation of above-mentioned adhesive hardens, comprise the rayed operation that makes above-mentioned photo-hardening composition sclerosis, the rayed amount in this rayed operation is 1000mJ/cm 2～6000mJ/cm 2
9. the manufacture method of the liquid-crystal apparatus described in claim 7 is characterized in that:
Make the operation of above-mentioned adhesive hardens, comprise the rayed operation that makes above-mentioned photo-hardening composition sclerosis, the rayed amount in this rayed operation is 1000mJ/cm 2～6000mJ/cm 2
10. the manufacture method of liquid-crystal apparatus as claimed in claim 6 is characterized in that:
Make the operation of above-mentioned adhesive hardens, comprise the heating process that makes above-mentioned thermosetting composition sclerosis, in this heating process, heating-up temperature is decided to be 60 ℃～160 ℃, will be decided to be 20 minutes～300 minutes heat time heating time.
11. the manufacture method of liquid-crystal apparatus as claimed in claim 7 is characterized in that:
Make the operation of above-mentioned adhesive hardens, comprise the heating process that makes above-mentioned thermosetting composition sclerosis, in this heating process, heating-up temperature is decided to be 60 ℃～160 ℃, will be decided to be 20 minutes～300 minutes heat time heating time.
12. an electronic equipment is characterized in that:
Possesses the liquid-crystal apparatus described in each of claim 1 to 3.
CNB03150079XA 2002-08-05 2003-07-31 Liquid crystal device its mfg. method, and electronic device Expired - Fee Related CN1273855C (en)

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